SRT rear diffusers are on (PIC)

[Detlef]

So first of all, a big thanks to treesnake for letting me copy his idea and providing me with the part number to the special rivets to use and a second big thanks to XVIPERS for the blades and letting me use the big daddy rivet gun to do the install. I think it looks pretty good from all angles.

Uh oh, the sky is looking nasty, better turn in for the evening.

 

[anton28]

wow that looks awsome. How does it feel at high speeds? is your rear end more stable? my rear lifts up at over 100 kinda scary. Would this solve the problem?

 

[BOTTLEFED]

looks great!

I'll be doing this someday
about how much did it cost you?

 

[triblk6spd]

Nice. love it!

 

[RobZilla]

The diffuser looks great but whats with the gigantic wheel gap and rediculous ride height??

 

[PaViper]

The diffuser looks great but whats with the gigantic wheel gap and rediculous ride height??

I thought the jack was still under it ....until I went and looked at mine from the same angle

 

[Detlef]

anton28: Haven't tried it yet but I doubt it will feel very different. With a completely stock suspension, my car feels stable going straight up to 150 (and yes that was at VOI8 on the Texas motor speedway, not the street). My main objective was doing something to the car to keep differentiating it from the other Sapphires in the VCA gang here. I also was told that this may reduce dust build up on the rear bumper, which on a dark car is always a good thing.

BOTTLEDFED: price was just over $200 in parts (blades and rivets)

RobZilla: Yes big wheel well gap, but this is Colorado and lowering is not practical.

 

[treesnake]

Hey Detlef
Guess I somehow missed this thread the first time...

Nice job. Wasn't all that bad, was it.

FWIW... I dyno'd the car before and after installing the diffusers.

I gained an additional 9 RWHP. Torque gains weren't that much...

 

[98viperGTS]

Love the look. I would like to do it to mine but I hate to have to drill holes in the rear bumper.

 

[dave6666]

Love the look. I would like to do it to mine but I hate to have to drill holes in the rear bumper.

Of course if you don't like the look then you don't want it on your car, but neither my diffuser nor the 2 Autoform diffusers require any additional holes than the ones that already exist.

One thing you could do if you don't like the black plate underneath is to paint the plate body color and leave the blades black. That could be done on any of the afore mentioned diffusers.

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[VIPER BAZ UK]

Looks good.....
Another to-do list...

 

[Detlef]

Hey Detlef
Guess I somehow missed this thread the first time...

Nice job. Wasn't all that bad, was it.

FWIW... I dyno'd the car before and after installing the diffusers.

I gained an additional 9 RWHP. Torque gains weren't that much...

No wasn't bad. Once I got the right rivet gun, it was pretty easy. Thanks again for all the pointers.

 

[treesnake]

No wasn't bad. Once I got the right rivet gun, it was pretty easy. Thanks again for all the pointers.

Let me know what kind of results you get on the dyno....

 

[Dr V]

Ive noticed the diffuser also on the 08 I just purchased too. Not to sound like a **** but what is the actual main purpose of this piece? Keeping u straight at high speeds??? Thanks

 

[Detlef]

Let me know what kind of results you get on the dyno....

No need to dyno, the seat of the pants feels like 8hp.
Probably due to less dust accumulating on the rear bumper and saving weight

Just kidding of course.

 

[Sweet Ride]

Ive noticed the diffuser also on the 08 I just purchased too. Not to sound like a **** but what is the actual main purpose of this piece? Keeping u straight at high speeds??? Thanks

The main purpose of the diffuser is to add rear downforce at speed. The diffuser makes for a cleaner flow of air underneath and out the back of the car.

 

[ViperTony]

The main purpose of the diffuser is to add rear downforce at speed. The diffuser makes for a cleaner flow of air underneath and out the back of the car.

Hmm...I understand the cleaner flow of air underneath and out the back of the car. Check. But not sure how it adds downforce. The rear diffuser panel with the blades attached to it slips into the belly pan under the transmission. Is air moving under the car and over the diffuser creating downforce? That doesn't appear to be the case unless I'm missing something. If you look on page 31 of the Spring 2009 Viper mag, there's a pic of the underside of the 2009 Viper that illustrates how that diffuser panel connects to the underside.

 

[dave6666]

A simple explanation...

APR Performance - Diffusers

 

[Sweet Ride]

Hmm...I understand the cleaner flow of air underneath and out the back of the car. Check. But not sure how it adds downforce. The rear diffuser panel with the blades attached to it slips into the belly pan under the transmission. Is air moving under the car and over the diffuser creating downforce? There doesn't appear to be the case unless I'm missing something. If you look on page 31 of the Spring 2009 Viper mag, there's a pic of the underside of the 2009 Viper that illustrates how that diffuser panel connects to the underside.

This would be easier to explain if I could draw a picture...

The air coming in from the front of the car creates pressure. Without a diffuser, that air is free to migrate out the back of the car at any speed and/or pressure. You also create turbulence at the rear end of the car. By adding a diffuser, you change the speed and pressure of the air that is flowing out the back of the vehicle, thus creating downforce. Combining this with a spoiler will also create a cleaner flow of air off the rear of the vehicle.

This is all of course dependant on a number of factors including vehicle speed, vehicle design, diffuser area, etc.

 

[ViperTony]

This would be easier to explain if I could draw a picture...

The air coming in from the front of the car creates pressure. Without a diffuser, that air is free to migrate out the back of the car at any speed and/or pressure. You also create turbulence at the rear end of the car. By adding a diffuser, you increase the speed and pressure of the air that is flowing out the back of the vehicle, thus creating downforce. Combining this with a spoiler will also create a cleaner flow of air off the rear of the vehicle.

This is all of course dependant on a number of factors including vehicle speed, vehcile design, diffuser area, etc.

I think Dave's article explains it. It reduces turbulence and lift but doesn't produce down force. There's a great picture of the underside on pg 31 of the spring issue of Viper mag.

 

[Mopar Boy]

Nice looking ride dude!

The diffuser adds a nice race loook to the car!

Robert

 

[Sweet Ride]

I think Dave's article explains it. It reduces turbulence and lift but doesn't produce down force. There's a great picture of the underside on pg 31 of the spring issue of Viper mag.

Isn't the opposite of reducing lift producing downforce?

According to this: "The diffuser itself does not actually create downforce..." I guess not.

Great article. It explains a lot!

 

[dave6666]

Here's another SRT diffuser on ebay.

This is not an ebay auction link







OK...

 

[Ricketts]

Not too shabby at all!!

 

[ViperTony]

Yeah, the SRT-10 diffuser is not going to fit without a fight on a GenII...even with an extreme cage match this diffuser may not work without a lot of modification. I test fitted it on my GenII, belted out a big laugh and put the diffuser away. I'll take another stab at this soon but expect a lot of carnage in the pics.